That's it. You've got it.
V.R. Metaphysical Aesthetics
Posted Jul 24 2018 - 06:19 PM
That's it. You've got it.
Posted Jul 25 2018 - 08:22 AM
Yes, that is it !!
My words were poorly chosen, before.
Posted Jul 27 2018 - 01:45 PM
The whole point tho is to say something.
Appreciate that when others do.
Pretty sure there are five slip angles, (four tires and car's center of mass), whose respective forces altogether establish a summative trajectory.
Due to each angle being on its own, effected by unique circumstance, at any time they can all be different.
Might not be what you want at that moment.
In general old school big slip drivers preferred more slip on rear (oversteer) than the front (understeer).
According to a reliable source, they would get a little more understeer dialed in for big tracks like Spa and have cars set up with a little more oversteer for twisty circuits like the Ring.
Edited by John Woods, Jul 27 2018 - 06:36 PM.
Posted Jul 27 2018 - 08:20 PM
There is a slip angle per tyre. Toe settings have a permanent effect on slip angle.
Also, slip angle does not equate to under- or oversteer. Some slip angle is required to push the fronts around the turn, in which case there is no understeer (yet).
Posted Jul 27 2018 - 08:44 PM
(Learned something new).
"Typical active safety systems that control the dynamics of passenger cars rely on the real-time monitoring of the vehicle sideslip angle (VSA), together with other signals such as the wheel angular velocities, steering angle, lateral acceleration, and the rate of rotation about the vertical axis, which is known as the yaw rate. The VSA (also known as the attitude or “drifting” angle) is defined as the angle between the vehicle’s longitudinal axis and the direction of travel, taking the centre of gravity as a reference. It is basically a measure of the misalignment between vehicle orientation and trajectory; therefore, it is a vital piece of information enabling directional stability assessment, such as in transience following emergency manoeuvres, for instance."
From:(PDF) On the Vehicle Sideslip Angle Estimation:.... Available from: https://www.research...and_Innovations [accessed Jul 27 2018].
Attachments found after a few minutes search for images.
Edited by John Woods, Jul 27 2018 - 09:21 PM.
Posted Jul 27 2018 - 09:23 PM
Posted Jul 27 2018 - 09:28 PM
What is that slip angle arrow telling us?
Posted Jul 27 2018 - 09:36 PM
Well, wish we could visit now that we're only 1,000 miles away.
Anything more to tell like why you're here, what you're doing?
This is from Wikipedia btw:
"slip angle or sideslip angle is the angle between a rolling wheel's actual direction of travel and the direction towards which it is pointing (i.e., the angle of the vector sum of wheel forward velocity v_x and lateral velocity v_y)"
Edited by John Woods, Jul 27 2018 - 09:50 PM.
Posted Jul 27 2018 - 09:52 PM
Posted Jul 27 2018 - 09:55 PM
Everyone loves Sanibel.
All the best.
Posted Jul 27 2018 - 09:58 PM
Kind of like being Assistent to the Regional Manager, but not Assistent Regional Manager (The Office US reference).
Posted Jul 28 2018 - 10:05 AM
The Sum of Two Vectors
"The sum, or resultant, of two vectors such as two forces acting on a single object is the single vector that could replace the two and have the same effect.
There are three steps to finding the sum of two vectors. These are illustrated by working out the sum of a 2 N force acting up the page and a 3 N force acting from left to right, both forces acting on the same object.
Draw an arrow that represents one of the vectors in both size and direction.
Starting where this arrow finishes, draw an arrow that represents the second vector in size and direction.
The sum, or resultant of the two vectors is represented (in both size and direction) by the single arrow drawn from the start of the first arrow to the finish of the second arrow.
In the example given, the size of the resultant force is 3.6 N and the direction is at an angle of 34° to the 3 N force. These figures were obtained by scale drawing."
(The example is shown in the attachment, appears very similar to slip angle diagram)
Unit Vectors | Brilliant Math & Science Wiki
"Vector quantities have a direction and a magnitude. However, sometimes one is interested in only the direction of the vector and not the magnitude. In such cases, for convenience, vectors are often "normalized" to be of unit length."
Plus, an arrow is universally used to diagram a vector.
Note in the first definition use of the words "could replace."
Could this be changed to "in the case of tire slip does replace the two and has the same effect, as demonstrated by new line of travel and by sidewall and tread distortion."
Edited by John Woods, Aug 02 2018 - 08:45 PM.
Posted Jul 29 2018 - 06:50 AM
Posted Jul 29 2018 - 09:54 AM
The direction of the vector sum is measured in terms of degrees away from a tire longitudinal axis.
But it is not itself a degree or an angle.
It is a vector.
Note in the attached from the Jet Propulsion Laboratory,
"For the front left wheel, the velocity vector v1 at the wheel center is shown. The angle a1 between v1 and the longitudinal axis of the tire is the tire-slip angle, which is defined as positive in the clockwise direction. The positive tire-slip angle shown in the figure generates a positive lateral tire force Fy1. The longitudinal tire force Fx1 is generated by a nonzero longitudinal tire slip. Together, Fx1 and Fy1 make up the tire force vector F1."
"Velocity is a vector - it has a magnitude and a direction."
Edited by John Woods, Aug 02 2018 - 08:46 PM.
Posted Jul 29 2018 - 10:59 AM
As far as technical/scientific diagrams go. Dont rely on them to be acurate, they are mostly to illustrate concepts rather than how the situation really looks like.
Edited by Michkov, Jul 29 2018 - 11:25 AM.
Posted Jul 29 2018 - 04:32 PM
"When the road surface is slanted, rather than horizontal, gravity acts on the vehicle in the tangent plane of the road surface, which affects the vehicle velocity. Assume for now that the road surface is horizontal. The dominant forces acting in the plane are the road-tire friction forces; we ignore smaller influences such as wind and air resistance. The road-tire friction forces are algebraic functions of the tire slips, which in turn are algebraic functions of the vehicle velocity. Consequently, measurements of the vehicle accelerations depend algebraically on the vehicle velocities, and the accelerations can therefore be used as indirect measurements of the velocities. In particular, the lateral acceleration ay contains valuable information about the lateral velocity."
Edited by John Woods, Jul 29 2018 - 04:36 PM.
Posted Jul 29 2018 - 06:00 PM
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